Okay, I created a virtual domain.
I created an admin user that is also a 'website admin user'
Upon going to that URL, and trying to log in to the admin interface, it is impossible, no matter what variant of the login I use.
if the domain is: domain.com and the admin user is: admin and the assigned login is: admin.domain
I am unable to get the user legitimately recognized, no matter what login format I use:
admin admin.domain firstname.lastname@example.org admin.domain.com
Logging is as JUST the domain name:
will work, but since it's not an admin, that really doesn't help much.
I have a feeling that this aspect (for whatever reason) still needs a little bit of work.